... ,GB3087-2008,GB5310-2008,GB6479-2000,GB9948-2006 Material St35.8, St44 ,St52, 20Mn2 ,10, 20,35,45, 16Mn,Q345,20G,20MnG ... , 30CrMo, 42CrMo Standard: ASTM-A106/A53/API5L Gr.B ST44, ST52 GB/8162, GB/8163 Surface Treatment: Galvanized or oil treatment ...